diff options
Diffstat (limited to 'arch/i386/math-emu/fpu_etc.c')
-rw-r--r-- | arch/i386/math-emu/fpu_etc.c | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/arch/i386/math-emu/fpu_etc.c b/arch/i386/math-emu/fpu_etc.c deleted file mode 100644 index e3b5d46..0000000 --- a/arch/i386/math-emu/fpu_etc.c +++ /dev/null @@ -1,143 +0,0 @@ -/*---------------------------------------------------------------------------+ - | fpu_etc.c | - | | - | Implement a few FPU instructions. | - | | - | Copyright (C) 1992,1993,1994,1997 | - | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | - | Australia. E-mail billm@suburbia.net | - | | - | | - +---------------------------------------------------------------------------*/ - -#include "fpu_system.h" -#include "exception.h" -#include "fpu_emu.h" -#include "status_w.h" -#include "reg_constant.h" - - -static void fchs(FPU_REG *st0_ptr, u_char st0tag) -{ - if ( st0tag ^ TAG_Empty ) - { - signbyte(st0_ptr) ^= SIGN_NEG; - clear_C1(); - } - else - FPU_stack_underflow(); -} - - -static void fabs(FPU_REG *st0_ptr, u_char st0tag) -{ - if ( st0tag ^ TAG_Empty ) - { - setpositive(st0_ptr); - clear_C1(); - } - else - FPU_stack_underflow(); -} - - -static void ftst_(FPU_REG *st0_ptr, u_char st0tag) -{ - switch (st0tag) - { - case TAG_Zero: - setcc(SW_C3); - break; - case TAG_Valid: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - break; - case TAG_Special: - switch ( FPU_Special(st0_ptr) ) - { - case TW_Denormal: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - if ( denormal_operand() < 0 ) - { -#ifdef PECULIAR_486 - /* This is weird! */ - if (getsign(st0_ptr) == SIGN_POS) - setcc(SW_C3); -#endif /* PECULIAR_486 */ - return; - } - break; - case TW_NaN: - setcc(SW_C0|SW_C2|SW_C3); /* Operand is not comparable */ - EXCEPTION(EX_Invalid); - break; - case TW_Infinity: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - break; - default: - setcc(SW_C0|SW_C2|SW_C3); /* Operand is not comparable */ - EXCEPTION(EX_INTERNAL|0x14); - break; - } - break; - case TAG_Empty: - setcc(SW_C0|SW_C2|SW_C3); - EXCEPTION(EX_StackUnder); - break; - } -} - - -static void fxam(FPU_REG *st0_ptr, u_char st0tag) -{ - int c = 0; - switch (st0tag) - { - case TAG_Empty: - c = SW_C3|SW_C0; - break; - case TAG_Zero: - c = SW_C3; - break; - case TAG_Valid: - c = SW_C2; - break; - case TAG_Special: - switch ( FPU_Special(st0_ptr) ) - { - case TW_Denormal: - c = SW_C2|SW_C3; /* Denormal */ - break; - case TW_NaN: - /* We also use NaN for unsupported types. */ - if ( (st0_ptr->sigh & 0x80000000) && (exponent(st0_ptr) == EXP_OVER) ) - c = SW_C0; - break; - case TW_Infinity: - c = SW_C2|SW_C0; - break; - } - } - if ( getsign(st0_ptr) == SIGN_NEG ) - c |= SW_C1; - setcc(c); -} - - -static FUNC_ST0 const fp_etc_table[] = { - fchs, fabs, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal, - ftst_, fxam, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal -}; - -void FPU_etc(void) -{ - (fp_etc_table[FPU_rm])(&st(0), FPU_gettag0()); -} |